uTools-Manuals/docs/java/javax/swing/JViewport.html

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     javax.swing 
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<h2 class="title" title="Class JViewport">Class JViewport</h2>
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<dt>
         All Implemented Interfaces: 
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<span><a href="../../java/awt/image/ImageObserver.html" title="java.awt.image中的接口">ImageObserver</a> ， <a href="../../java/awt/MenuContainer.html" title="java.awt中的接口">MenuContainer</a> ， <a href="../../java/io/Serializable.html" title="java.io中的接口">Serializable</a> ， <a href="../../javax/accessibility/Accessible.html" title="javax.accessibility中的接口">Accessible</a></span>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">JViewport</span>
extends <a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a>
implements <a href="../../javax/accessibility/Accessible.html" title="interface in javax.accessibility">Accessible</a></pre>
<div class="block">
<span>您可以通过它查看基础信息的“视口”或“舷窗”。</span>
<span>滚动时，视口是什么。</span>
<span>就像窥视相机的取景器。</span>
<span>向上移动取景器会在图片的顶部带来新的东西，并丢失最底层的东西。</span>
<p> <span>默认情况下， <code>JViewport</code>是不透明的。</span> <span>要更改此，请使用<code>setOpaque</code>方法。</span> </p>
<p> <span><b>注意：</b>我们实现了一个更快的滚动算法，不需要缓冲区来绘制。算法的工作原理如下：</span> </p>
<ol>
<li> <span>视图和父视图，并检查它们是否为<code>JComponents</code> ，如果不是，停止并重绘整个视口。</span> </li>
<li> <span>如果视口被祖先隐藏，则停止并重新绘制整个视口。</span> </li>
<li> <span>计算将变得可见的区域，如果它与视口一样大，停止并重新绘制整个视图区域。</span> </li>
<li> <span>获取祖先<code>Window</code>的图形，并在滚动区域上做一个<code>copyArea</code> 。</span> </li>
<li> <span>提醒观点重绘新近可见的地区。</span> </li>
<li> <span>下一次在视口上调用paint时，如果剪辑区域小于视口大小，则定时器被启动以重绘整个区域。</span> </li>
</ol>
<span>一般来说，这种方法要快得多。</span>
<span>与后备存储方法相比，这避免了维护屏幕外缓冲区的开销，并且不得不做两个<code>copyArea</code> 。</span>
<span>与非后备店相比，这种方法将大大减少涂漆区域。</span>
<p> <span>当视口被另一个窗口或部分屏幕遮挡时，这种方法可能导致比后备存储方法更慢的时间。</span> <span>当另一个窗口遮蔽视口时，copyArea将复制垃圾，系统将生成一个绘画事件，以通知我们我们需要绘制新曝光的区域。</span> <span>处理这种情况的唯一方法是重绘整个视口，这可能会导致比后备存储盒慢的性能。</span> <span>在大多数应用程序中，当视口被另一个窗口或屏幕遮挡时，用户很少会滚动，所以这种优化通常在被遮蔽时是值得的。</span> </p>
<p> <span><strong>警告：</strong> Swing不是线程安全的。</span> <span>有关更多信息，请参阅<a href="package-summary.html#threading">Swing's Threading Policy</a> 。</span> </p>
<p> <span><strong>警告：</strong>此类的序列化对象与将来的Swing版本不兼容。</span> <span>当前的序列化支持适用于运行相同版本的Swing的应用程序之间的短期存储或RMI。</span> <span>从1.4版本开始，所有JavaBeans的长期存储支持已被添加到<code>java.beans</code>软件包中。</span> <span>请参阅<a href="../../java/beans/XMLEncoder.html" title="java.beans中的类"><code>XMLEncoder</code></a> 。</span> </p>
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<dl>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/swing/JScrollPane.html" title="javax.swing中的类"><code>JScrollPane</code></a></span>
</dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.AccessibleJViewport.html" title="class in javax.swing">JViewport.AccessibleJViewport</a></span></code>
<div class="block">
              这个类实现了可访问性支持 
             <code>JViewport</code>类。 
            </div> </td>
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<td class="colFirst"><code>protected class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.ViewListener.html" title="class in javax.swing">JViewport.ViewListener</a></span></code>
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              视图的监听器。 
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<span>Fields</span>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#backingStore">backingStore</a></span></code>
<div class="block">
<span><span class="deprecatedLabel">已弃用</span></span>
<div class="block">
<span><span class="deprecationComment">从Java 2平台v1.3开始</span></span>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#BACKINGSTORE_SCROLL_MODE">BACKINGSTORE_SCROLL_MODE</a></span></code>
<div class="block">
              将视口内容绘制到屏幕外的图像中。 
            </div> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../java/awt/Image.html" title="class in java.awt">Image</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#backingStoreImage">backingStoreImage</a></span></code>
<div class="block">
              用于后台存储的视图图像。 
            </div> </td>
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<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#BLIT_SCROLL_MODE">BLIT_SCROLL_MODE</a></span></code>
<div class="block">
              使用 
             <code>graphics.copyArea</code>实现滚动。 
            </div> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#isViewSizeSet">isViewSizeSet</a></span></code>
<div class="block">
              当确定视口尺寸时为真。 
            </div> </td>
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<td class="colFirst"><code>protected <a href="../../java/awt/Point.html" title="class in java.awt">Point</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#lastPaintPosition">lastPaintPosition</a></span></code>
<div class="block">
              最后一个 
             <code>viewPosition</code> ，我们已经画了，所以我们知道多少后备店的图像是有效的。 
            </div> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#scrollUnderway">scrollUnderway</a></span></code>
<div class="block">
<code>scrollUnderway</code>标志用于JList等 
             <code>JList</code> 。 
            </div> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#SIMPLE_SCROLL_MODE">SIMPLE_SCROLL_MODE</a></span></code>
<div class="block">
              此模式使用非常简单的方式，每次滚动时重新绘制滚动窗格的全部内容。 
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#JViewport--">JViewport</a></span>()</code>
<div class="block">
              创建一个 
             <code>JViewport</code> 。 
            </div> </td>
</tr>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#addChangeListener-javax.swing.event.ChangeListener-">addChangeListener</a></span>(<a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a> l)</code>
<div class="block">
              每当视图的大小，位置或视口的范围大小发生更改时， 
             <code>ChangeListener</code>添加到列表中。 
            </div> </td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#addImpl-java.awt.Component-java.lang.Object-int-">addImpl</a></span>(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> child, <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> constraints, int index)</code>
<div class="block">
              设置 
             <code>JViewport</code>的一个轻量级的孩子，可以是 
             <code>null</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#addNotify--">addNotify</a></span>()</code>
<div class="block">
              通知此组件它现在有一个父组件。 
            </div> </td>
</tr>
<tr class="rowColor" id="i3">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#computeBlit-int-int-java.awt.Point-java.awt.Point-java.awt.Dimension-java.awt.Rectangle-">computeBlit</a></span>(int dx, int dy, <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> blitFrom, <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> blitTo, <a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> blitSize, <a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a> blitPaint)</code>
<div class="block">
              计算，其中后备存储图像当前包含blit的参数 
             <code>oldLoc</code>在左上角和我们滚动到 
             <code>newLoc</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i4">
<td class="colFirst"><code>protected <a href="../../java/awt/LayoutManager.html" title="interface in java.awt">LayoutManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#createLayoutManager--">createLayoutManager</a></span>()</code>
<div class="block">
              子类可以覆盖此值，以在构造函数中安装不同的布局管理器（或 
             <code>null</code> ）。 
            </div> </td>
</tr>
<tr class="rowColor" id="i5">
<td class="colFirst"><code>protected <a href="../../javax/swing/JViewport.ViewListener.html" title="class in javax.swing">JViewport.ViewListener</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#createViewListener--">createViewListener</a></span>()</code>
<div class="block">
              为视图创建一个侦听器。 
            </div> </td>
</tr>
<tr class="altColor" id="i6">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#firePropertyChange-java.lang.String-java.lang.Object-java.lang.Object-">firePropertyChange</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> propertyName, <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> oldValue, <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> newValue)</code>
<div class="block">
              通知侦听器属性更改。 
            </div> </td>
</tr>
<tr class="rowColor" id="i7">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#fireStateChanged--">fireStateChanged</a></span>()</code>
<div class="block">
              当视图大小，位置或视口扩展大小已更改时，通知所有 
             <code>ChangeListeners</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i8">
<td class="colFirst"><code><a href="../../javax/accessibility/AccessibleContext.html" title="class in javax.accessibility">AccessibleContext</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getAccessibleContext--">getAccessibleContext</a></span>()</code>
<div class="block">
              获取与此JViewport关联的AccessibleContext。 
            </div> </td>
</tr>
<tr class="rowColor" id="i9">
<td class="colFirst"><code><a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getChangeListeners--">getChangeListeners</a></span>()</code>
<div class="block">
              返回使用addChangeListener（）添加到此JViewport的所有 
             <code>ChangeListener</code>的数组。 
            </div> </td>
</tr>
<tr class="altColor" id="i10">
<td class="colFirst"><code><a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getExtentSize--">getExtentSize</a></span>()</code>
<div class="block">
              返回视图坐标中视图的可见部分的大小。 
            </div> </td>
</tr>
<tr class="rowColor" id="i11">
<td class="colFirst"><code><a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getInsets--">getInsets</a></span>()</code>
<div class="block">
              返回inset（边框）维（0,0,0,0），因为上不支持边框上 
             <code>JViewport</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i12">
<td class="colFirst"><code><a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getInsets-java.awt.Insets-">getInsets</a></span>(<a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a> insets)</code>
<div class="block">
              返回一个 
             <code>Insets</code>这个 
             <code>JViewport</code>的插入值的 
             <code>Insets</code>对象。 
            </div> </td>
</tr>
<tr class="rowColor" id="i13">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getScrollMode--">getScrollMode</a></span>()</code>
<div class="block">
              返回当前滚动模式。 
            </div> </td>
</tr>
<tr class="altColor" id="i14">
<td class="colFirst"><code><a href="../../javax/swing/plaf/ViewportUI.html" title="class in javax.swing.plaf">ViewportUI</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getUI--">getUI</a></span>()</code>
<div class="block">
              返回渲染此组件的L＆F对象。 
            </div> </td>
</tr>
<tr class="rowColor" id="i15">
<td class="colFirst"><code><a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getUIClassID--">getUIClassID</a></span>()</code>
<div class="block">
              返回一个字符串，它指定呈现此组件的L＆F类的名称。 
            </div> </td>
</tr>
<tr class="altColor" id="i16">
<td class="colFirst"><code><a href="../../java/awt/Component.html" title="class in java.awt">Component</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getView--">getView</a></span>()</code>
<div class="block">
              返回 
             <code>JViewport</code>的一个孩子或 
             <code>null</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i17">
<td class="colFirst"><code><a href="../../java/awt/Point.html" title="class in java.awt">Point</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getViewPosition--">getViewPosition</a></span>()</code>
<div class="block">
              返回出现在视口左上角的视图坐标，如果没有视图则返回0,0。 
            </div> </td>
</tr>
<tr class="altColor" id="i18">
<td class="colFirst"><code><a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getViewRect--">getViewRect</a></span>()</code>
<div class="block">
              返回原型为 
             <code>getViewPosition</code> ，大小为 
             <code>getExtentSize</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i19">
<td class="colFirst"><code><a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#getViewSize--">getViewSize</a></span>()</code>
<div class="block">
              如果视图的大小尚未被明确设置，返回首选大小，否则返回视图的当前大小。 
            </div> </td>
</tr>
<tr class="altColor" id="i20">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#isBackingStoreEnabled--">isBackingStoreEnabled</a></span>()</code>
<div class="block">
<span><span class="deprecatedLabel">已弃用</span></span>
<div class="block">
<span><span class="deprecationComment">从Java 2平台v1.3开始，由<code>getScrollMode()</code> 。</span></span>
</div>
</div> </td>
</tr>
<tr class="rowColor" id="i21">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#isOptimizedDrawingEnabled--">isOptimizedDrawingEnabled</a></span>()</code>
<div class="block">
<code>JViewport</code>覆盖此方法的默认实现（在 
             <code>JComponent</code> ）以返回false。 
            </div> </td>
</tr>
<tr class="altColor" id="i22">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#isPaintingOrigin--">isPaintingOrigin</a></span>()</code>
<div class="block">
              如果滚动模式是一个 
             <code>BACKINGSTORE_SCROLL_MODE</code> ，使绘画起源于 
             <code>JViewport</code>或其祖先之一，则返回true。 
            </div> </td>
</tr>
<tr class="rowColor" id="i23">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#paint-java.awt.Graphics-">paint</a></span>(<a href="../../java/awt/Graphics.html" title="class in java.awt">Graphics</a> g)</code>
<div class="block">
              根据是否启用 
             <code>backingStore</code> ，可以通过后台存储来绘制图像，也可以仅绘制最近曝光的部分，使用后备存储将“其余部分”设置为“blit”。 
            </div> </td>
</tr>
<tr class="altColor" id="i24">
<td class="colFirst"><code>protected <a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#paramString--">paramString</a></span>()</code>
<div class="block">
              返回此 
             <code>JViewport</code>的字符串表示 
             <code>JViewport</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i25">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#remove-java.awt.Component-">remove</a></span>(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> child)</code>
<div class="block">
              删除 
             <code>Viewport</code>的一个轻量级的孩子。 
            </div> </td>
</tr>
<tr class="altColor" id="i26">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#removeChangeListener-javax.swing.event.ChangeListener-">removeChangeListener</a></span>(<a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a> l)</code>
<div class="block">
              每次视图大小，位置或视口扩展区大小更改时， 
             <code>ChangeListener</code>从列表中删除 
             <code>ChangeListener</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i27">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#repaint-long-int-int-int-int-">repaint</a></span>(long tm, int x, int y, int w, int h)</code>
<div class="block">
              在父母总是重新绘制坐标系，以确保只有一个漆是由执行 
             <code>RepaintManager</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i28">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#reshape-int-int-int-int-">reshape</a></span>(int x, int y, int w, int h)</code>
<div class="block">
              设置此视口的边界。 
            </div> </td>
</tr>
<tr class="rowColor" id="i29">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#scrollRectToVisible-java.awt.Rectangle-">scrollRectToVisible</a></span>(<a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a> contentRect)</code>
<div class="block">
              滚动视图，使 
             <code>Rectangle</code>内的 
             <code>Rectangle</code>变得可见。 
            </div> </td>
</tr>
<tr class="altColor" id="i30">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setBackingStoreEnabled-boolean-">setBackingStoreEnabled</a></span>(boolean enabled)</code>
<div class="block">
<span><span class="deprecatedLabel">已弃用</span></span>
<div class="block">
<span><span class="deprecationComment">从Java 2平台v1.3开始，由<code>setScrollMode()</code>取代。</span></span>
</div>
</div> </td>
</tr>
<tr class="rowColor" id="i31">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setBorder-javax.swing.border.Border-">setBorder</a></span>(<a href="../../javax/swing/border/Border.html" title="interface in javax.swing.border">Border</a> border)</code>
<div class="block">
              视口通过正常的父/子剪辑（通常视图沿滚动的相反方向移动）“滚动”其孩子（称为“视图”）。 
            </div> </td>
</tr>
<tr class="altColor" id="i32">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setExtentSize-java.awt.Dimension-">setExtentSize</a></span>(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> newExtent)</code>
<div class="block">
              使用视图坐标设置视图的可见部分的大小。 
            </div> </td>
</tr>
<tr class="rowColor" id="i33">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setScrollMode-int-">setScrollMode</a></span>(int mode)</code>
<div class="block">
              用于控制滚动视口内容的方法。 
            </div> </td>
</tr>
<tr class="altColor" id="i34">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setUI-javax.swing.plaf.ViewportUI-">setUI</a></span>(<a href="../../javax/swing/plaf/ViewportUI.html" title="class in javax.swing.plaf">ViewportUI</a> ui)</code>
<div class="block">
              设置渲染此组件的L＆F对象。 
            </div> </td>
</tr>
<tr class="rowColor" id="i35">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setView-java.awt.Component-">setView</a></span>(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> view)</code>
<div class="block">
              设置 
             <code>JViewport</code>的一个轻量级的孩子（ 
             <code>view</code> ），可以是 
             <code>null</code> 。 
            </div> </td>
</tr>
<tr class="altColor" id="i36">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setViewPosition-java.awt.Point-">setViewPosition</a></span>(<a href="../../java/awt/Point.html" title="class in java.awt">Point</a> p)</code>
<div class="block">
              设置出现在视口左上角的视图坐标，如果没有视图，则不执行任何操作。 
            </div> </td>
</tr>
<tr class="rowColor" id="i37">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#setViewSize-java.awt.Dimension-">setViewSize</a></span>(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> newSize)</code>
<div class="block">
              设置视图的大小。 
            </div> </td>
</tr>
<tr class="altColor" id="i38">
<td class="colFirst"><code><a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#toViewCoordinates-java.awt.Dimension-">toViewCoordinates</a></span>(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> size)</code>
<div class="block">
              转换像素坐标中的大小以查看坐标。 
            </div> </td>
</tr>
<tr class="rowColor" id="i39">
<td class="colFirst"><code><a href="../../java/awt/Point.html" title="class in java.awt">Point</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#toViewCoordinates-java.awt.Point-">toViewCoordinates</a></span>(<a href="../../java/awt/Point.html" title="class in java.awt">Point</a> p)</code>
<div class="block">
              转换像素坐标中的点以查看坐标。 
            </div> </td>
</tr>
<tr class="altColor" id="i40">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/JViewport.html#updateUI--">updateUI</a></span>()</code>
<div class="block">
              将UI属性重置为当前外观的值。 
            </div> </td>
</tr>
</tbody>
</table>
<ul class="blockList">
<li class="blockList"><a name="methods.inherited.from.class.javax.swing.JComponent">
<!-- --> </a> <h3>Methods inherited from class javax.swing.<a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></h3> <code><a href="../../javax/swing/JComponent.html#addAncestorListener-javax.swing.event.AncestorListener-">addAncestorListener</a>, <a href="../../javax/swing/JComponent.html#addVetoableChangeListener-java.beans.VetoableChangeListener-">addVetoableChangeListener</a>, <a href="../../javax/swing/JComponent.html#computeVisibleRect-java.awt.Rectangle-">computeVisibleRect</a>, <a href="../../javax/swing/JComponent.html#contains-int-int-">contains</a>, <a href="../../javax/swing/JComponent.html#createToolTip--">createToolTip</a>, <a href="../../javax/swing/JComponent.html#disable--">disable</a>, <a href="../../javax/swing/JComponent.html#enable--">enable</a>, <a href="../../javax/swing/JComponent.html#firePropertyChange-java.lang.String-boolean-boolean-">firePropertyChange</a>, <a href="../../javax/swing/JComponent.html#firePropertyChange-java.lang.String-char-char-">firePropertyChange</a>, <a href="../../javax/swing/JComponent.html#firePropertyChange-java.lang.String-int-int-">firePropertyChange</a>, <a href="../../javax/swing/JComponent.html#fireVetoableChange-java.lang.String-java.lang.Object-java.lang.Object-">fireVetoableChange</a>, <a href="../../javax/swing/JComponent.html#getActionForKeyStroke-javax.swing.KeyStroke-">getActionForKeyStroke</a>, <a href="../../javax/swing/JComponent.html#getActionMap--">getActionMap</a>, <a href="../../javax/swing/JComponent.html#getAlignmentX--">getAlignmentX</a>, <a href="../../javax/swing/JComponent.html#getAlignmentY--">getAlignmentY</a>, <a href="../../javax/swing/JComponent.html#getAncestorListeners--">getAncestorListeners</a>, <a href="../../javax/swing/JComponent.html#getAutoscrolls--">getAutoscrolls</a>, <a href="../../javax/swing/JComponent.html#getBaseline-int-int-">getBaseline</a>, <a href="../../javax/swing/JComponent.html#getBaselineResizeBehavior--">getBaselineResizeBehavior</a>, <a href="../../javax/swing/JComponent.html#getBorder--">getBorder</a>, <a href="../../javax/swing/JComponent.html#getBounds-java.awt.Rectangle-">getBounds</a>, <a href="../../javax/swing/JComponent.html#getClientProperty-java.lang.Object-">getClientProperty</a>, <a href="../../javax/swing/JComponent.html#getComponentGraphics-java.awt.Graphics-">getComponentGraphics</a>, <a href="../../javax/swing/JComponent.html#getComponentPopupMenu--">getComponentPopupMenu</a>, <a href="../../javax/swing/JComponent.html#getConditionForKeyStroke-javax.swing.KeyStroke-">getConditionForKeyStroke</a>, <a href="../../javax/swing/JComponent.html#getDebugGraphicsOptions--">getDebugGraphicsOptions</a>, <a href="../../javax/swing/JComponent.html#getDefaultLocale--">getDefaultLocale</a>, <a href="../../javax/swing/JComponent.html#getFontMetrics-java.awt.Font-">getFontMetrics</a>, <a href="../../javax/swing/JComponent.html#getGraphics--">getGraphics</a>, <a href="../../javax/swing/JComponent.html#getHeight--">getHeight</a>, <a href="../../javax/swing/JComponent.html#getInheritsPopupMenu--">getInheritsPopupMenu</a>, <a href="../../javax/swing/JComponent.html#getInputMap--">getInputMap</a>, <a href="../../javax/swing/JComponent.html#getInputMap-int-">getInputMap</a>, <a href="../../javax/swing/JComponent.html#getInputVerifier--">getInputVerifier</a>, <a href="../../javax/swing/JComponent.html#getListeners-java.lang.Class-">getListeners</a>, <a href="../../javax/swing/JComponent.html#getLocation-java.awt.Point-">getLocation</a>, <a href="../../javax/swing/JComponent.html#getMaximumSize--">getMaximumSize</a>, <a href="../../javax/swing/JComponent.html#getMinimumSize--">getMinimumSize</a>, <a href="../../javax/swing/JComponent.html#getNextFocusableComponent--">getNextFocusableComponent</a>, <a href="../../javax/swing/JComponent.html#getPopupLocation-java.awt.event.MouseEvent-">getPopupLocation</a>, <a href="../../javax/swing/JComponent.html#getPreferredSize--">getPreferredSize</a>, <a href="../../javax/swing/JComponent.html#getRegisteredKeyStrokes--">getRegisteredKeyStrokes</a>, <a href="../../javax/swing/JComponent.html#getRootPane--">getRootPane</a>, <a href="../../javax/swing/JComponent.html#getSize-java.awt.Dimension-">getSize</a>, <a href="../../javax/swing/JComponent.html#getToolTipLocation-java.awt.event.MouseEvent-">getToolTipLocation</a>, <a href="../../javax/swing/JComponent.html#getToolTipText--">getToolTipText</a>, <a href="../../javax/swing/JComponent.html#getToolTipText-java.awt.event.MouseEvent-">getToolTipText</a>, <a href="../../javax/swing/JComponent.html#getTopLevelAncestor--">getTopLevelAncestor</a>, <a href="../../javax/swing/JComponent.html#getTransferHandler--">getTransferHandler</a>, <a href="../../javax/swing/JComponent.html#getVerifyInputWhenFocusTarget--">getVerifyInputWhenFocusTarget</a>, <a href="../../javax/swing/JComponent.html#getVetoableChangeListeners--">getVetoableChangeListeners</a>, <a href="../../javax/swing/JComponent.html#getVisibleRect--">getVisibleRect</a>, <a href="../../javax/swing/JComponent.html#getWidth--">getWidth</a>, <a href="../../javax/swing/JComponent.html#getX--">getX</a>, <a href="../../javax/swing/JComponent.html#getY--">getY</a>, <a href="../../javax/swing/JComponent.html#grabFocus--">grabFocus</a>, <a href="../../javax/swing/JComponent.html#hide--">hide</a>, <a href="../../javax/swing/JComponent.html#isDoubleBuffered--">isDoubleBuffered</a>, <a href="../../javax/swing/JComponent.html#isLightweightComponent-java.awt.Component-">isLightweightComponent</a>, <a href="../../javax/swing/JComponent.html#isManagingFocus--">isManagingFocus</a>, <a href="../../javax/swing/JComponent.html#isOpaque--">isOpaque</a>, <a href="../../javax/swing/JComponent.html#isPaintingForPrint--">isPaintingForPrint</a>, <a href="../../javax/swing/JComponent.html#isPaintingTile--">isPaintingTile</a>, <a href="../../javax/swing/JComponent.html#isRequestFocusEnabled--">isRequestFocusEnabled</a>, <a href="../../javax/swing/JComponent.html#isValidateRoot--">isValidateRoot</a>, <a href="../../javax/swing/JComponent.html#paintBorder-java.awt.Graphics-">paintBorder</a>, <a href="../../javax/swing/JComponent.html#paintChildren-java.awt.Graphics-">paintChildren</a>, <a href="../../javax/swing/JComponent.html#paintComponent-java.awt.Graphics-">paintComponent</a>, <a href="../../javax/swing/JComponent.html#paintImmediately-int-int-int-int-">paintImmediately</a>, <a href="../../javax/swing/JComponent.html#paintImmediately-java.awt.Rectangle-">paintImmediately</a>, <a href="../../javax/swing/JComponent.html#print-java.awt.Graphics-">print</a>, <a href="../../javax/swing/JComponent.html#printAll-java.awt.Graphics-">printAll</a>, <a href="../../javax/swing/JComponent.html#printBorder-java.awt.Graphics-">printBorder</a>, <a href="../../javax/swing/JComponent.html#printChildren-java.awt.Graphics-">printChildren</a>, <a href="../../javax/swing/JComponent.html#printComponent-java.awt.Graphics-">printComponent</a>, <a href="../../javax/swing/JComponent.html#processComponentKeyEvent-java.awt.event.KeyEvent-">processComponentKeyEvent</a>, <a href="../../javax/swing/JComponent.html#processKeyBinding-javax.swing.KeyStroke-java.awt.event.KeyEvent-int-boolean-">processKeyBinding</a>, <a href="../../javax/swing/JComponent.html#processKeyEvent-java.awt.event.KeyEvent-">processKeyEvent</a>, <a href="../../javax/swing/JComponent.html#processMouseEvent-java.awt.event.MouseEvent-">processMouseEvent</a>, <a href="../../javax/swing/JComponent.html#processMouseMotionEvent-java.awt.event.MouseEvent-">processMouseMotionEvent</a>, <a href="../../javax/swing/JComponent.html#putClientProperty-java.lang.Object-java.lang.Object-">putClientProperty</a>, <a href="../../javax/swing/JComponent.html#registerKeyboardAction-java.awt.event.ActionListener-javax.swing.KeyStroke-int-">registerKeyboardAction</a>, <a href="../../javax/swing/JComponent.html#registerKeyboardAction-java.awt.event.ActionListener-java.lang.String-javax.swing.KeyStroke-int-">registerKeyboardAction</a>, <a href="../../javax/swing/JComponent.html#removeAncestorListener-javax.swing.event.AncestorListener-">removeAncestorListener</a>, <a href="../../javax/swing/JComponent.html#removeNotify--">removeNotify</a>, <a href="../../javax/swing/JComponent.html#removeVetoableChangeListener-java.beans.VetoableChangeListener-">removeVetoableChangeListener</a>, <a href="../../javax/swing/JComponent.html#repaint-java.awt.Rectangle-">repaint</a>, <a href="../../javax/swing/JComponent.html#requestDefaultFocus--">requestDefaultFocus</a>, <a href="../../javax/swing/JComponent.html#requestFocus--">requestFocus</a>, <a href="../../javax/swing/JComponent.html#requestFocus-boolean-">requestFocus</a>, <a href="../../javax/swing/JComponent.html#requestFocusInWindow--">requestFocusInWindow</a>, <a href="../../javax/swing/JComponent.html#requestFocusInWindow-boolean-">requestFocusInWindow</a>, <a href="../../javax/swing/JComponent.html#resetKeyboardActions--">resetKeyboardActions</a>, <a href="../../javax/swing/JComponent.html#revalidate--">revalidate</a>, <a href="../../javax/swing/JComponent.html#setActionMap-javax.swing.ActionMap-">setActionMap</a>, <a href="../../javax/swing/JComponent.html#setAlignmentX-float-">setAlignmentX</a>, <a href="../../javax/swing/JComponent.html#setAlignmentY-float-">setAlignmentY</a>, <a href="../../javax/swing/JComponent.html#setAutoscrolls-boolean-">setAutoscrolls</a>, <a href="../../javax/swing/JComponent.html#setBackground-java.awt.Color-">setBackground</a>, <a href="../../javax/swing/JComponent.html#setComponentPopupMenu-javax.swing.JPopupMenu-">setComponentPopupMenu</a>, <a href="../../javax/swing/JComponent.html#setDebugGraphicsOptions-int-">setDebugGraphicsOptions</a>, <a href="../../javax/swing/JComponent.html#setDefaultLocale-java.util.Locale-">setDefaultLocale</a>, <a href="../../javax/swing/JComponent.html#setDoubleBuffered-boolean-">setDoubleBuffered</a>, <a href="../../javax/swing/JComponent.html#setEnabled-boolean-">setEnabled</a>, <a href="../../javax/swing/JComponent.html#setFocusTraversalKeys-int-java.util.Set-">setFocusTraversalKeys</a>, <a href="../../javax/swing/JComponent.html#setFont-java.awt.Font-">setFont</a>, <a href="../../javax/swing/JComponent.html#setForeground-java.awt.Color-">setForeground</a>, <a href="../../javax/swing/JComponent.html#setInheritsPopupMenu-boolean-">setInheritsPopupMenu</a>, <a href="../../javax/swing/JComponent.html#setInputMap-int-javax.swing.InputMap-">setInputMap</a>, <a 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<li class="blockList"> <h4>isViewSizeSet</h4> <pre>protected boolean isViewSizeSet</pre>
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<span>当确定视口尺寸时为真。</span>
<span>默认值为false。</span>
</div> </li>
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<li class="blockList"> <h4>lastPaintPosition</h4> <pre>protected <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> lastPaintPosition</pre>
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            最后一个 
           <code>viewPosition</code> ，我们画了，所以我们知道多少后备店的图像是有效的。 
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protected boolean backingStore</pre>
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<span><span class="deprecatedLabel">已弃用</span></span>
<span><span class="deprecationComment">从Java 2平台v1.3开始</span></span>
</div>
<div class="block">
<span>当此视口保持其内容的屏幕外图像时，该值为True，以便可以使用快速“位”功能进行某些滚动，而不是通过访问视图对象来构建显示。</span>
<span>默认值为<code>false</code> 。</span>
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<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setScrollMode-int-"><code>setScrollMode(int)</code></a>
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<li class="blockList"> <h4>backingStoreImage</h4> <pre>protected transient <a href="../../java/awt/Image.html" title="class in java.awt">Image</a> backingStoreImage</pre>
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            用于后台存储的视图图像。 
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<li class="blockList"> <h4>scrollUnderway</h4> <pre>protected boolean scrollUnderway</pre>
<div class="block">
<span><code>scrollUnderway</code>标志用于JList等<code>JList</code> 。</span>
<span>当DownArrow中文按键上<code>JList</code>以及选择小区在列表的最后，该<code>scrollpane</code> autoscrolls。</span>
<span>在这里，旧的选定单元格需要重新绘制，因此我们需要一个标志，使视口仅在显示调用<code>setViewPosition(Point)</code>时进行<code>setViewPosition(Point)</code> 。</span>
<span>当通过其他路由调用<code>setBounds</code>时，标志关闭，视图正常显示。</span>
<span>另一种方法是将其从<code>JViewport</code>类中删除，并通过使用<code>setBackingStoreEnabled</code> <code>JList</code>管理<code>setBackingStoreEnabled</code> 。</span>
<span>默认值为<code>false</code> 。</span>
</div> </li>
</ul> <a name="BLIT_SCROLL_MODE">
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<ul class="blockList">
<li class="blockList"> <h4>BLIT_SCROLL_MODE</h4> <pre>public static final int BLIT_SCROLL_MODE</pre>
<div class="block">
<span>使用<code>graphics.copyArea</code>实现滚动。</span>
<span>这是大多数应用程序中最快的。</span>
</div>
<dl>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setScrollMode-int-"><code>setScrollMode(int)</code></a> ， 
            <a href="../../constant-values.html#javax.swing.JViewport.BLIT_SCROLL_MODE">Constant Field Values</a>
</dd>
</dl> </li>
</ul> <a name="BACKINGSTORE_SCROLL_MODE">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>BACKINGSTORE_SCROLL_MODE</h4> <pre>public static final int BACKINGSTORE_SCROLL_MODE</pre>
<div class="block">
<span>将视口内容绘制到屏幕外的图像中。</span>
<span>这是以前的默认模式<code>JTable</code> 。</span>
<span>在某些情况下，此模式可能会优于“blit模式”，但它需要大量额外的RAM。</span>
</div>
<dl>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setScrollMode-int-"><code>setScrollMode(int)</code></a> ， 
            <a href="../../constant-values.html#javax.swing.JViewport.BACKINGSTORE_SCROLL_MODE">Constant Field Values</a>
</dd>
</dl> </li>
</ul> <a name="SIMPLE_SCROLL_MODE">
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<ul class="blockListLast">
<li class="blockList"> <h4>SIMPLE_SCROLL_MODE</h4> <pre>public static final int SIMPLE_SCROLL_MODE</pre>
<div class="block">
<span>此模式使用非常简单的方式，每次滚动时重新绘制滚动窗格的全部内容。</span>
<span>这是Swing 1.0和Swing 1.1中的默认行为。</span>
<span>在大多数情况下，其他两个选项都将提供更好的性能。</span>
</div>
<dl>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setScrollMode-int-"><code>setScrollMode(int)</code></a> ， 
            <a href="../../constant-values.html#javax.swing.JViewport.SIMPLE_SCROLL_MODE">Constant Field Values</a>
</dd>
</dl> </li>
</ul> </li>
</ul>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor.detail">
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<ul class="blockListLast">
<li class="blockList"> <h4>JViewport</h4> <pre>public JViewport()</pre>
<div class="block">
            创建一个 
           <code>JViewport</code> 。 
          </div> </li>
</ul> </li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
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<ul class="blockList">
<li class="blockList"> <h4>getUI</h4> <pre>public <a href="../../javax/swing/plaf/ViewportUI.html" title="class in javax.swing.plaf">ViewportUI</a> getUI()</pre>
<div class="block">
            返回渲染此组件的L＆F对象。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>ViewportUI</code>对象 
           </dd>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
</dl> </li>
</ul> <a name="setUI-javax.swing.plaf.ViewportUI-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>setUI</h4> <pre>public void setUI(<a href="../../javax/swing/plaf/ViewportUI.html" title="class in javax.swing.plaf">ViewportUI</a> ui)</pre>
<div class="block">
            设置渲染此组件的L＆F对象。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>ui</code> - 
            <code>ViewportUI</code> L＆F对象 
           </dd>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/UIDefaults.html#getUI-javax.swing.JComponent-"><code>UIDefaults.getUI(javax.swing.JComponent)</code></a>
</dd>
</dl> </li>
</ul> <a name="updateUI--">
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<ul class="blockList">
<li class="blockList"> <h4>updateUI</h4> <pre>public void updateUI()</pre>
<div class="block">
            将UI属性重置为当前外观的值。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#updateUI--">updateUI</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#updateUI--"><code>JComponent.updateUI()</code></a>
</dd>
</dl> </li>
</ul> <a name="getUIClassID--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getUIClassID</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getUIClassID()</pre>
<div class="block">
            返回一个字符串，它指定呈现此组件的L＆F类的名称。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#getUIClassID--">getUIClassID</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             字符串“ViewportUI” 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#getUIClassID--"><code>JComponent.getUIClassID()</code></a> ， 
            <a href="../../javax/swing/UIDefaults.html#getUI-javax.swing.JComponent-"><code>UIDefaults.getUI(javax.swing.JComponent)</code></a>
</dd>
</dl> </li>
</ul> <a name="addImpl-java.awt.Component-java.lang.Object-int-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>addImpl</h4> <pre>protected void addImpl(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> child,
                       <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> constraints,
                       int index)</pre>
<div class="block">
<span>设置<code>JViewport</code>的一个轻量级的孩子，可以是<code>null</code> 。</span>
<span>（由于只有一个孩子占据整个视口， <code>constraints</code>和<code>index</code>参数将被忽略。）</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../java/awt/Container.html#addImpl-java.awt.Component-java.lang.Object-int-">addImpl</a></code>在 
            <code><a href="../../java/awt/Container.html" title="class in java.awt">Container</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>child</code> - 视口的轻量级 
            <code>child</code>
</dd>
<dd>
<code>constraints</code> -在 
            <code>constraints</code>被尊重 
           </dd>
<dd>
<code>index</code> - 指数 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setView-java.awt.Component-"><code>setView(java.awt.Component)</code></a>
</dd>
</dl> </li>
</ul> <a name="remove-java.awt.Component-">
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<ul class="blockList">
<li class="blockList"> <h4>remove</h4> <pre>public void remove(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> child)</pre>
<div class="block">
            删除 
           <code>Viewport</code>的一个轻量级的孩子。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../java/awt/Container.html#remove-java.awt.Component-">remove</a></code>在 
            <code><a href="../../java/awt/Container.html" title="class in java.awt">Container</a></code>类 
           </dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>child</code> - 要删除的组件 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setView-java.awt.Component-"><code>setView(java.awt.Component)</code></a>
</dd>
</dl> </li>
</ul> <a name="addNotify--">
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<ul class="blockList">
<li class="blockList"> <h4>addNotify</h4> <pre>public void addNotify()</pre>
<div class="block">
<span class="descfrmTypeLabel">描述从类别复制： <code><a href="../../javax/swing/JComponent.html#addNotify--">JComponent</a></code></span>
</div>
<div class="block">
<span>通知此组件它现在有一个父组件。</span>
<span>当调用此方法时，父组件链设置为<code>KeyboardAction</code>事件侦听器。</span>
<span>该方法在内部被工具包调用，不应该被程序直接调用。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#addNotify--">addNotify</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#registerKeyboardAction-java.awt.event.ActionListener-java.lang.String-javax.swing.KeyStroke-int-"><code>JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)</code></a>
</dd>
</dl> </li>
</ul> <a name="scrollRectToVisible-java.awt.Rectangle-">
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<ul class="blockList">
<li class="blockList"> <h4>scrollRectToVisible</h4> <pre>public void scrollRectToVisible(<a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a> contentRect)</pre>
<div class="block">
<span>滚动视图，使<code>Rectangle</code>内的<code>Rectangle</code>变得可见。</span>
<p> <span>如果视图当前无效， <code>isValid</code>尝试在滚动之前验证视图 - <code>isValid</code>返回false。</span> <span>为避免在创建包含层次结构时进行过度验证，如果其中一个祖先没有对等体，或者没有验证的根祖先，或者其中一个祖先不是<code>Window</code>或<code>Applet</code> ，则不会验证。</span> </p>
<p> <span>请注意，此方法不会滚动到有效的视口之外;</span> <span>例如，如果<code>contentRect</code>大于视口，则滚动将仅限于视口的边界。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#scrollRectToVisible-java.awt.Rectangle-">scrollRectToVisible</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>contentRect</code> - 要显示的 
            <code>Rectangle</code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#isValidateRoot--"><code>JComponent.isValidateRoot()</code></a> ， 
            <a href="../../java/awt/Component.html#isValid--"><code>Component.isValid()</code></a> ， 
            <a href="../../java/awt/Component.html#getPeer--"><code>Component.getPeer()</code></a>
</dd>
</dl> </li>
</ul> <a name="setBorder-javax.swing.border.Border-">
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<ul class="blockList">
<li class="blockList"> <h4>setBorder</h4> <pre>public final void setBorder(<a href="../../javax/swing/border/Border.html" title="interface in javax.swing.border">Border</a> border)</pre>
<div class="block">
<span>视口通过正常的父/子剪辑（通常视图沿滚动的相反方向移动）“滚动”其孩子（称为“视图”）。</span>
<span>不支持非<code>null</code>边框或非零插值，以防止此组件的几何变得足够复杂以阻止子类化。</span>
<span>要创建具有边框的<code>JViewport</code> ，请将其添加到具有边框的<code>JPanel</code> 。</span>
<p> <span>注意：如果<code>border</code>是非<code>null</code> ，该方法将抛出一个异常上不支持边框上<code>JViewPort</code> 。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#setBorder-javax.swing.border.Border-">setBorder</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>border</code> - 要设置的 
            <code>Border</code>
</dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 此方法未实现 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/swing/border/Border.html" title="javax.swing.border中的接口"><code>Border</code></a> ， <a href="../../javax/swing/border/CompoundBorder.html" title="javax.swing.border中的类"><code>CompoundBorder</code></a></span>
</dd>
</dl> </li>
</ul> <a name="getInsets--">
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<ul class="blockList">
<li class="blockList"> <h4>getInsets</h4> <pre>public final <a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a> getInsets()</pre>
<div class="block">
            由于边框不支持JViewport，因此将 
           <code>JViewport</code>作为（0,0,0,0） 
           <code>JViewport</code> 。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#getInsets--">getInsets</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个零尺寸和 
            <code>Rectangle</code>的Rectangle 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setBorder-javax.swing.border.Border-"><code>setBorder(javax.swing.border.Border)</code></a>
</dd>
</dl> </li>
</ul> <a name="getInsets-java.awt.Insets-">
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<ul class="blockList">
<li class="blockList"> <h4>getInsets</h4> <pre>public final <a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a> getInsets(<a href="../../java/awt/Insets.html" title="class in java.awt">Insets</a> insets)</pre>
<div class="block">
<span>返回一个<code>Insets</code>对象，其中包含这个<code>JViewport</code>的插入值。</span>
<span>传入的<code>Insets</code>对象将被重新初始化，并且该对象内的所有现有值都将被覆盖。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#getInsets-java.awt.Insets-">getInsets</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>insets</code> - 可重复使用的 
            <code>Insets</code>对象 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             这个视口插入值 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#getInsets--"><code>getInsets()</code></a>
</dd>
</dl> </li>
</ul> <a name="isOptimizedDrawingEnabled--">
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<ul class="blockList">
<li class="blockList"> <h4>isOptimizedDrawingEnabled</h4> <pre>public boolean isOptimizedDrawingEnabled()</pre>
<div class="block">
<span>该<code>JViewport</code>覆盖此方法的默认实现（ <code>JComponent</code> ）返回false。</span>
<span>这确保了绘图机器将调用<code>Viewport</code>的<code>paint</code>实现，而不是直接<code>JViewport</code>的孩子。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#isOptimizedDrawingEnabled--">isOptimizedDrawingEnabled</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             假 
           </dd>
</dl> </li>
</ul> <a name="isPaintingOrigin--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>isPaintingOrigin</h4> <pre>protected boolean isPaintingOrigin()</pre>
<div class="block">
<span>如果滚动模式是一个<code>BACKINGSTORE_SCROLL_MODE</code> ，使绘画来源于<code>JViewport</code>或其祖先之一，则返回true。</span>
<span>否则返回<code>false</code> 。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#isPaintingOrigin--">isPaintingOrigin</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>类 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             如果滚动模式是 
            <code>BACKINGSTORE_SCROLL_MODE</code> 。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#isPaintingOrigin--"><code>JComponent.isPaintingOrigin()</code></a>
</dd>
</dl> </li>
</ul> <a name="paint-java.awt.Graphics-">
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<ul class="blockList">
<li class="blockList"> <h4>paint</h4> <pre>public void paint(<a href="../../java/awt/Graphics.html" title="class in java.awt">Graphics</a> g)</pre>
<div class="block">
<span>根据是否启用<code>backingStore</code> ，可以通过后台存储来绘制图像，也可以仅绘制最近曝光的部分，使用后备存储将其余部分“blit”。</span>
<blockquote>
<span>The term "blit" is the pronounced version of the PDP-10 BLT (BLock Transfer) instruction, which copied a block of bits. (In case you were curious.)</span>
</blockquote>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#paint-java.awt.Graphics-">paint</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>g</code> - 要绘画的 
            <code>Graphics</code>上下文 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#paintComponent-java.awt.Graphics-"><code>JComponent.paintComponent(java.awt.Graphics)</code></a> ， 
            <a href="../../javax/swing/JComponent.html#paintBorder-java.awt.Graphics-"><code>JComponent.paintBorder(java.awt.Graphics)</code></a> ， 
            <a href="../../javax/swing/JComponent.html#paintChildren-java.awt.Graphics-"><code>JComponent.paintChildren(java.awt.Graphics)</code></a> ， 
            <a href="../../javax/swing/JComponent.html#getComponentGraphics-java.awt.Graphics-"><code>JComponent.getComponentGraphics(java.awt.Graphics)</code></a> ， 
            <a href="../../javax/swing/JComponent.html#repaint-long-int-int-int-int-"><code>JComponent.repaint(long, int, int, int, int)</code></a>
</dd>
</dl> </li>
</ul> <a name="reshape-int-int-int-int-">
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<ul class="blockList">
<li class="blockList"> <h4>reshape</h4> <pre>public void reshape(int x,
                    int y,
                    int w,
                    int h)</pre>
<div class="block">
<span>设置此视口的边界。</span>
<span>如果视口的宽度或高度已更改，请<code>StateChanged</code>一个<code>StateChanged</code>事件。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#reshape-int-int-int-int-">reshape</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>x</code> - 原始的左边缘 
           </dd>
<dd>
<code>y</code> - 起源的上边缘 
           </dd>
<dd>
<code>w</code> - 以像素为单位的宽度 
           </dd>
<dd>
<code>h</code> - 像素高 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JComponent.html#reshape-int-int-int-int-"><code>JComponent.reshape(int, int, int, int)</code></a>
</dd>
</dl> </li>
</ul> <a name="setScrollMode-int-">
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<ul class="blockList">
<li class="blockList"> <h4>setScrollMode</h4> <pre>public void setScrollMode(int mode)</pre>
<div class="block">
<span>用于控制滚动视口内容的方法。</span>
<span>您可能想要更改此模式，以获得用例的最大性能。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<span><code>mode</code> - 以下值之一：</span>
<ul>
<li> <span>JViewport.BLIT_SCROLL_MODE</span> </li>
<li> <span>JViewport.BACKINGSTORE_SCROLL_MODE</span> </li>
<li> <span>JViewport.SIMPLE_SCROLL_MODE</span> </li>
</ul>
</dd>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#BLIT_SCROLL_MODE"><code>BLIT_SCROLL_MODE</code></a> ， 
            <a href="../../javax/swing/JViewport.html#BACKINGSTORE_SCROLL_MODE"><code>BACKINGSTORE_SCROLL_MODE</code></a> ， 
            <a href="../../javax/swing/JViewport.html#SIMPLE_SCROLL_MODE"><code>SIMPLE_SCROLL_MODE</code></a>
</dd>
</dl> </li>
</ul> <a name="getScrollMode--">
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<ul class="blockList">
<li class="blockList"> <h4>getScrollMode</h4> <pre>public int getScrollMode()</pre>
<div class="block">
            返回当前滚动模式。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
<code>scrollMode</code>属性 
           </dd>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.3 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setScrollMode-int-"><code>setScrollMode(int)</code></a>
</dd>
</dl> </li>
</ul> <a name="isBackingStoreEnabled--">
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<ul class="blockList">
<li class="blockList"> <h4>isBackingStoreEnabled</h4> <pre><a href="../../java/lang/Deprecated.html" title="annotation in java.lang">@Deprecated</a>
public boolean isBackingStoreEnabled()</pre>
<div class="block">
<span><span class="deprecatedLabel">已弃用</span></span>
<span><span class="deprecationComment">从Java 2平台v1.3开始，由<code>getScrollMode()</code>取代。</span></span>
</div>
<div class="block">
            如果此视口保持其内容的屏幕外图像，则返回 
           <code>true</code> 。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
<code>true</code>如果 
            <code>scrollMode</code>是 
            <code>BACKINGSTORE_SCROLL_MODE</code>
</dd>
</dl> </li>
</ul> <a name="setBackingStoreEnabled-boolean-">
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<ul class="blockList">
<li class="blockList"> <h4>setBackingStoreEnabled</h4> <pre><a href="../../java/lang/Deprecated.html" title="annotation in java.lang">@Deprecated</a>
public void setBackingStoreEnabled(boolean enabled)</pre>
<div class="block">
<span><span class="deprecatedLabel">已弃用</span></span>
<span><span class="deprecationComment">从Java 2平台v1.3开始，由<code>setScrollMode()</code> 。</span></span>
</div>
<div class="block">
<span>如果此视口将保持其内容的屏幕外图像，则为true。</span>
<span>该图像用于降低对viewPosition的小尺寸变化的<code>viewPosition</code> 。</span>
<span>而不是重绘整个视口，我们使用<code>Graphics.copyArea</code>来实现一些滚动。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>enabled</code> - 如果是真的，请维护一个非屏幕后备店 
           </dd>
</dl> </li>
</ul> <a name="getView--">
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<ul class="blockList">
<li class="blockList"> <h4>getView</h4> <pre>public <a href="../../java/awt/Component.html" title="class in java.awt">Component</a> getView()</pre>
<div class="block">
            返回 
           <code>JViewport</code>的一个孩子或 
           <code>null</code> 。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             视口小孩，如果没有， 
            <code>null</code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#setView-java.awt.Component-"><code>setView(java.awt.Component)</code></a>
</dd>
</dl> </li>
</ul> <a name="setView-java.awt.Component-">
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<ul class="blockList">
<li class="blockList"> <h4>setView</h4> <pre>public void setView(<a href="../../java/awt/Component.html" title="class in java.awt">Component</a> view)</pre>
<div class="block">
            设置 
           <code>JViewport</code>的一个轻便孩子（ 
           <code>view</code> ），可以是 
           <code>null</code> 。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>view</code> - 视口的新的轻量级的孩子 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#getView--"><code>getView()</code></a>
</dd>
</dl> </li>
</ul> <a name="getViewSize--">
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<ul class="blockList">
<li class="blockList"> <h4>getViewSize</h4> <pre>public <a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> getViewSize()</pre>
<div class="block">
<span>如果视图的大小尚未被明确设置，返回首选大小，否则返回视图的当前大小。</span>
<span>如果没有视图，返回0,0。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>Dimension</code>视图大小的 
            <code>Dimension</code>对象 
           </dd>
</dl> </li>
</ul> <a name="setViewSize-java.awt.Dimension-">
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<ul class="blockList">
<li class="blockList"> <h4>setViewSize</h4> <pre>public void setViewSize(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> newSize)</pre>
<div class="block">
<span>设置视图的大小。</span>
<span>国家改变的事件将被解雇。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>newSize</code> - 一个 
            <code>Dimension</code>对象，指定视图的新大小 
           </dd>
</dl> </li>
</ul> <a name="getViewPosition--">
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<ul class="blockList">
<li class="blockList"> <h4>getViewPosition</h4> <pre>public <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> getViewPosition()</pre>
<div class="block">
            返回出现在视口左上角的视图坐标，如果没有视图则返回0,0。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>Point</code>对象给出左上角的坐标 
           </dd>
</dl> </li>
</ul> <a name="setViewPosition-java.awt.Point-">
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<ul class="blockList">
<li class="blockList"> <h4>setViewPosition</h4> <pre>public void setViewPosition(<a href="../../java/awt/Point.html" title="class in java.awt">Point</a> p)</pre>
<div class="block">
            设置出现在视口左上角的视图坐标，如果没有视图，则不执行任何操作。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>p</code> - 给出左上坐标的 
            <code>Point</code>对象 
           </dd>
</dl> </li>
</ul> <a name="getViewRect--">
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<ul class="blockList">
<li class="blockList"> <h4>getViewRect</h4> <pre>public <a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a> getViewRect()</pre>
<div class="block">
<span>返回原型为<code>getViewPosition</code>且大小为<code>getExtentSize</code> 。</span>
<span>这是视图中可见部分，视图坐标。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>Rectangle</code>使用视图坐标给出视图的可见部分。 
           </dd>
</dl> </li>
</ul> <a name="computeBlit-int-int-java.awt.Point-java.awt.Point-java.awt.Dimension-java.awt.Rectangle-">
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<ul class="blockList">
<li class="blockList"> <h4>computeBlit</h4> <pre>protected boolean computeBlit(int dx,
                              int dy,
                              <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> blitFrom,
                              <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> blitTo,
                              <a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> blitSize,
                              <a href="../../java/awt/Rectangle.html" title="class in java.awt">Rectangle</a> blitPaint)</pre>
<div class="block">
<span>计算，其中后备存储图像当前包含blit的参数<code>oldLoc</code>在左上角和我们滚动到<code>newLoc</code> 。</span>
<span>修改参数以返回blit所需的值。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>dx</code> - 水平三角形 
           </dd>
<dd>
<code>dy</code> - 垂直三角洲 
           </dd>
<dd>
<code>blitFrom</code> - 
            <code>Point</code>我们是从 
            <code>Point</code>
</dd>
<dd>
<code>blitTo</code> - 
            <code>Point</code>我们是blitting 
           </dd>
<dd>
<code>blitSize</code> - 该地区的 
            <code>Dimension</code>
</dd>
<dd>
<code>blitPaint</code> - 区域blit 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
<span>如果参数被修改并且我们已经准备好了，则为true;</span>
<span>否则为假</span>
</dd>
</dl> </li>
</ul> <a name="getExtentSize--">
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<ul class="blockList">
<li class="blockList"> <h4>getExtentSize</h4> <pre>public <a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> getExtentSize()</pre>
<div class="block">
            返回视图坐标中视图的可见部分的大小。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个给出视图大小的 
            <code>Dimension</code>对象 
           </dd>
</dl> </li>
</ul> <a name="toViewCoordinates-java.awt.Dimension-">
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<ul class="blockList">
<li class="blockList"> <h4>toViewCoordinates</h4> <pre>public <a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> toViewCoordinates(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> size)</pre>
<div class="block">
<span>转换像素坐标中的大小以查看坐标。</span>
<span>支持“逻辑坐标”的视口子类将覆盖此方法。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>size</code> - 使用像素坐标的 
            <code>Dimension</code>对象 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>Dimension</code>对象转换为查看坐标 
           </dd>
</dl> </li>
</ul> <a name="toViewCoordinates-java.awt.Point-">
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<ul class="blockList">
<li class="blockList"> <h4>toViewCoordinates</h4> <pre>public <a href="../../java/awt/Point.html" title="class in java.awt">Point</a> toViewCoordinates(<a href="../../java/awt/Point.html" title="class in java.awt">Point</a> p)</pre>
<div class="block">
<span>转换像素坐标中的点以查看坐标。</span>
<span>支持“逻辑坐标”的视口子类将覆盖此方法。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>p</code> - 一个使用像素坐标的 
            <code>Point</code>对象 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>Point</code>对象转换为查看坐标 
           </dd>
</dl> </li>
</ul> <a name="setExtentSize-java.awt.Dimension-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>setExtentSize</h4> <pre>public void setExtentSize(<a href="../../java/awt/Dimension.html" title="class in java.awt">Dimension</a> newExtent)</pre>
<div class="block">
            使用视图坐标设置视图的可见部分的大小。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>newExtent</code> - 一个 
            <code>Dimension</code>视图大小的 
            <code>Dimension</code>对象 
           </dd>
</dl> </li>
</ul> <a name="createViewListener--">
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<ul class="blockList">
<li class="blockList"> <h4>createViewListener</h4> <pre>protected <a href="../../javax/swing/JViewport.ViewListener.html" title="class in javax.swing">JViewport.ViewListener</a> createViewListener()</pre>
<div class="block">
            为视图创建一个侦听器。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>ViewListener</code>
</dd>
</dl> </li>
</ul> <a name="createLayoutManager--">
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<ul class="blockList">
<li class="blockList"> <h4>createLayoutManager</h4> <pre>protected <a href="../../java/awt/LayoutManager.html" title="interface in java.awt">LayoutManager</a> createLayoutManager()</pre>
<div class="block">
<span>子类可以覆盖此值，以在构造函数中安装不同的布局管理器（或<code>null</code> ）。</span>
<span>返回<code>LayoutManager</code>安装在<code>JViewport</code> 。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个 
            <code>LayoutManager</code>
</dd>
</dl> </li>
</ul> <a name="addChangeListener-javax.swing.event.ChangeListener-">
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<ul class="blockList">
<li class="blockList"> <h4>addChangeListener</h4> <pre>public void addChangeListener(<a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a> l)</pre>
<div class="block">
            将每个视图的大小，位置或视口的范围大小更改时通知的列表中添加一个 
           <code>ChangeListener</code> 。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>l</code> - 
            <code>ChangeListener</code>加 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#removeChangeListener-javax.swing.event.ChangeListener-"><code>removeChangeListener(javax.swing.event.ChangeListener)</code></a> ， 
            <a href="../../javax/swing/JViewport.html#setViewPosition-java.awt.Point-"><code>setViewPosition(java.awt.Point)</code></a> ， 
            <a href="../../javax/swing/JViewport.html#setViewSize-java.awt.Dimension-"><code>setViewSize(java.awt.Dimension)</code></a> ， 
            <a href="../../javax/swing/JViewport.html#setExtentSize-java.awt.Dimension-"><code>setExtentSize(java.awt.Dimension)</code></a>
</dd>
</dl> </li>
</ul> <a name="removeChangeListener-javax.swing.event.ChangeListener-">
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<ul class="blockList">
<li class="blockList"> <h4>removeChangeListener</h4> <pre>public void removeChangeListener(<a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a> l)</pre>
<div class="block">
            每次视图大小，位置或视口扩展区大小更改时， 
           <code>ChangeListener</code>从列表中删除 
           <code>ChangeListener</code> 。 
          </div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>l</code> - 要删除的 
            <code>ChangeListener</code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/JViewport.html#addChangeListener-javax.swing.event.ChangeListener-"><code>addChangeListener(javax.swing.event.ChangeListener)</code></a>
</dd>
</dl> </li>
</ul> <a name="getChangeListeners--">
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<ul class="blockList">
<li class="blockList"> <h4>getChangeListeners</h4> <pre>public <a href="../../javax/swing/event/ChangeListener.html" title="interface in javax.swing.event">ChangeListener</a>[] getChangeListeners()</pre>
<div class="block">
            返回使用addChangeListener（）添加到此JViewport的所有 
           <code>ChangeListener</code>的数组。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             添加了所有 
            <code>ChangeListener</code>或者如果没有添加侦听器，则为空数组 
           </dd>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
             1.4 
           </dd>
</dl> </li>
</ul> <a name="fireStateChanged--">
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<ul class="blockList">
<li class="blockList"> <h4>fireStateChanged</h4> <pre>protected void fireStateChanged()</pre>
<div class="block">
            当视图大小，位置或视口扩展大小已更改时，通知所有 
           <code>ChangeListeners</code> 。 
          </div>
<dl>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/swing/JViewport.html#addChangeListener-javax.swing.event.ChangeListener-"><code>addChangeListener(javax.swing.event.ChangeListener)</code></a> ， <a href="../../javax/swing/JViewport.html#removeChangeListener-javax.swing.event.ChangeListener-"><code>removeChangeListener(javax.swing.event.ChangeListener)</code></a> ， <a href="../../javax/swing/event/EventListenerList.html" title="javax.swing.event中的类"><code>EventListenerList</code></a></span>
</dd>
</dl> </li>
</ul> <a name="repaint-long-int-int-int-int-">
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<ul class="blockList">
<li class="blockList"> <h4>repaint</h4> <pre>public void repaint(long tm,
                    int x,
                    int y,
                    int w,
                    int h)</pre>
<div class="block">
            在父母总是重新绘制坐标系，以确保只有一个漆是由执行 
           <code>RepaintManager</code> 。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#repaint-long-int-int-int-int-">repaint</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>tm</code> - 更新前的最大时间（以毫秒为单位） 
           </dd>
<dd>
<code>x</code> - 
            <code>x</code>坐标（从左上方的像素） 
           </dd>
<dd>
<code>y</code> - 
            <code>y</code>坐标（从上至下的像素） 
           </dd>
<dd>
<code>w</code> - 宽度 
           </dd>
<dd>
<code>h</code> - 高度 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../java/awt/Component.html#update-java.awt.Graphics-"><code>Component.update(java.awt.Graphics)</code></a>
</dd>
</dl> </li>
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<li class="blockList"> <h4>paramString</h4> <pre>protected <a href="../../java/lang/String.html" title="class in java.lang">String</a> paramString()</pre>
<div class="block">
<span>返回此<code>JViewport</code>的字符串表示<code>JViewport</code> 。</span>
<span>该方法仅用于调试目的，并且返回的字符串的内容和格式可能因实现而异。</span>
<span>返回的字符串可能为空，但可能不是<code>null</code> 。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../javax/swing/JComponent.html#paramString--">paramString</a></code>在 
            <code><a href="../../javax/swing/JComponent.html" title="class in javax.swing">JComponent</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             这个 
            <code>JViewport</code>的字符串表示 
            <code>JViewport</code>
</dd>
</dl> </li>
</ul> <a name="firePropertyChange-java.lang.String-java.lang.Object-java.lang.Object-">
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<ul class="blockList">
<li class="blockList"> <h4>firePropertyChange</h4> <pre>protected void firePropertyChange(<a href="../../java/lang/String.html" title="class in java.lang">String</a> propertyName,
                                  <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> oldValue,
                                  <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> newValue)</pre>
<div class="block">
<span>通知侦听器属性更改。</span>
<span>这是子类更新<code>windowBlit</code>属性。</span>
<span>（ <code>putClientProperty</code>属性是最终的）。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../java/awt/Component.html#firePropertyChange-java.lang.String-java.lang.Object-java.lang.Object-">firePropertyChange</a></code>在 
            <code><a href="../../java/awt/Component.html" title="class in java.awt">Component</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>propertyName</code> - 包含属性名称的字符串 
           </dd>
<dd>
<code>oldValue</code> - 该物业的旧值 
           </dd>
<dd>
<code>newValue</code> - 物业的新价值 
           </dd>
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<li class="blockList"> <h4>getAccessibleContext</h4> <pre>public <a href="../../javax/accessibility/AccessibleContext.html" title="class in javax.accessibility">AccessibleContext</a> getAccessibleContext()</pre>
<div class="block">
<span>获取与此JViewport关联的AccessibleContext。</span>
<span>对于视口，AccessibleContext采用AccessibleJViewport的形式。</span>
<span>如有必要，将创建一个新的AccessibleJViewport实例。</span>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../javax/accessibility/Accessible.html#getAccessibleContext--">getAccessibleContext</a></code>在接口 
            <code><a href="../../javax/accessibility/Accessible.html" title="interface in javax.accessibility">Accessible</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../java/awt/Component.html#getAccessibleContext--">getAccessibleContext</a></code>在 
            <code><a href="../../java/awt/Component.html" title="class in java.awt">Component</a></code>类 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一个AccessibleJViewport，用作此JViewport的AccessibleContext 
           </dd>
</dl> </li>
</ul> </li>
</ul> </li>
</ul>
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